Boring bar drive means



Am. 20, 1935. c. T. ROTTLER BORING BAR DRIVE MEANS 4 Sheets-Sheet I 1 Filed Nov. 22, 1932 INVENTOR C renceiiotfler Aug. 20, 1935. c. T. ROTTLER 2,011,875

BORING BAR DRIVE MEANS Filed Nov, 22, 1952 4Sheets-Sheet 2 INVENTOR I" a B g W c. T. ROTTLER 2,011,875

BORING BAR DRIVE MEANS Filed Nov. 22, 1932 4 Sheets-Sheet 5- I 'lgi IN VENT OR Claggnce Tfiaffler Aug. 29, 1935. c T ROTTLER 2,@11,875

BORING BAR DRIVE MEANS Filed Nov. 22, 1952 4 Sheet-Shet 4 INVENTOR Claggnce Tattler V r Patented Auglzb, 1935 I I I i UNETED STATES TENT OFFICE a I -2,011,875 n v BORING BAR DRIVE H Cla ence 'r. Rottler, Seattle, Wash. Application November--22, 1932, Serial No. 843,858 1 7 v 14. Claims. (01577- 2) My invention relates to-bori-ng bars, machines Figure 6 is a top plan view of the upper end for boring or reboring the cylinders of .internal of the boring bar. t combustion engines, or the like The present Figure 7 is a view similar to Figure 5, and-Figinvention isconcerned with ameans. to drive. the urefl8 is a view similar to Figures 3 and 4, illus Y rotary tool, and .to effect feed and; retraction crating a slightly modified construction. 5 thereof, while a companion application fis con"- 'Ingen eral the tool comprises a base framei),

cerned with the generalassembly of the tool and A a boring bar 2 vertically disposed and guided in the mounting, of the boring bar. H the frame 9 for vertical movement, a rotary tool Such a machine] must be lifted about and a '3 supported at the lower end ofthe boring bar,

10 placed upon the upper surface of a cylinderfbl'ock a motor 99 or equivalent means for delivering 10 which is being bored or rebored. In consequence; power .to the machine, preferably integrally it must be as light and compact as possiblethavmounted upon the base frame 9, a rotary screw l ing consideration for the heavy work it must do, journa-ledin the .frame 9 and driven by the so that it may be moved without too'great difmotor 1 90, and operatively' connected, through 5 ficulty and accurately positioned by the 'memeans which in the embodiment. illustrated are 'chanic. It follows that it cannothave "incorenclosed withinthe-casing 20, toaccomplish not porated in it complicated gear shift and clutch only rotation of the tool'3 but axial movement mechanisms, yet it is highly desirable to provide of the boringbar 25in each direction. The drive the following: (a) means to drive the rotary from the motors!) to'the'screw i maybe through tool; (b) means to advance the tool slowly as it j any suitable means, but preferably is through a 20. rotates; (0) means to retract the tool rapidly reductiongear illustrated at 9|, which, however, after a out has been completed; and (d) for may befvaried as desired, and-which forms; no special occasions, as will appear in the description essential part of the present invention, except of the companion case, it is desirable to provide as, it ispreferable that the screw rotateat a means operable upon certain occasions for ad- I slower rate-of. speed than that :of' the usual .elecr 25 45 indicated by such claims.

vancing or projecting the tool rapidly. trio motor. 7 l

. t is an object of the present invention to de- In order that the operation of the drive means vise a boring bar meeting theabove requirements, may be understood it will-now be explained how I which is compact and simple in its construction' therotary tool is supported and driven with rela and operation, and thoroughly rugged and servtion to the boring bar.. It may be pointed 1 out 30 iceable. I v first. that the rotary tool comprises a casing 30 My invention comprises the novel parts, a'nd a tool 3] which projects radially therefrom, and the novel combination, and arrangement of J such centering means 32 which are projectable at will parts, in the accomplishment of the above ends, from within the casing '30 to'engage the sides of 35 as is shown in the accompanying drawings, dethe cylinder C which is being bored or rebored. 35 scribed in this specification, and as will be more Arod 33 serves to control projection and retrac-' particularly pointed out by the claims which tion of;the,.tool. 3I, for it is essential that the terminatethe same. i tool be not projected, and in contact with the In the accompanying drawings I have shown wallsbof a-cylinder C which has been bored, dur- 40 my invention embodied in illustrative forms such ing the time the tool is' retracted. .The connec- 40 as are at present preferred by me, it being tion between the rod and the tool it is not necesunderstood that the principles thereof, as pointed sary to describe herejhowever,v and it is fully. out in the specification' and claims, may be 'in-- described and claimedinthe companion applicorporated in various forms, within the scope cation referred to above. Sufiice it to say that! I the rod 33 is reciproc'ably mounted,and is nor- Figure l is'aside elevation of my boring bar, mally held down by a springv'33; when the rod with parts broken away. is raised the tool is retracted, and when the. rod Figure 2 is an elevation of the sametaken at is down the tool is projected. "Surrounding this right angles to Figure 1. rod is a tube 34 which extends entirely through a Figure 3 is anaxial' section through the upper the boring bar, and upon the lower end .of which 50 part of the boring bar andthe screw, andFigure is; supported the rotary tool 3. The. latter is 4' is a similar view, showing parts in a different rotatable with the tube 34 and at its upper end' operative position. the tube 34 is keyed toadrivengear 35 (see Fig Figure 5 is a section substantially on the'line ures 3 afid 4).

5 55 of Figure 4. Q V

-"-I'he caSlI1g 20 is rigidly fixed upon theup'per 5 end of the boring bar ,2, and therefore moves vertically with the boring bar, and parts supported or received in the casing are in effect held upon the boring bar, and in fact are held by the casing in definite relation to the boring bar. The

screw I extends through this casing, and within.

thecasing there is threaded upon the screw a nut i0. 'Journaled within the casing about the screw l is adrive gear 4 which has asliding ieather engagement with the screw, to be rotated thereby- Thus the'key 43 is shown in-Figure 3, received in a groove [4 in the screw l.

Journaled coaxially with the drive gear 4 is a differential gear 5. This gear is preferably interposed between the nut l0 .and the 'drive gear 4, and while it is of substantially the same di-.

ameter as the drive gear 4, it has a slightly different number of teeth, for instance, slightly fewer teeth than the drive gear 4. In a commer-, cial machine, the gear 4 has thirty-four teeth, and the gear 5- has thirty-three. Both these gears, however, are in mesh with the driven gear 35 previously referredfto, which in the same commercial machine has lthirty teeth. a

The engagement of the drive geard," rotated from'the rotary. screw I, with the driven gear 35 connected to the rotary tool, causes rotation .of the tool at a rate of speed which is a function of the diametrical relationship of the gears 4 and 35.' 'If these are of nearly the same diameter,

substantially as shown herein, the rate of rotation of the tool is nearly the same as the rate of rotation of the screw l. Because of themeshing' of the difierential gear 5 withthe driven gear 3 5, the differential gear 5 will be rotated,'butjbecause it has, in the 'examplegiven, slightly fewer teeth than the drive gear 4, there will be a slightly faster peripheral rate of advance of the gear 5 with relationto the gear 4.

the same speed as the screw i there would be no advance ofthe boring bar, which in effect carries the nut l0, longitudinally ofithescrew. If,

however, the nut is made to turn at a rate slight- 69, may be provided to control the movement of the complemental clutch sleeve 6, and by this or like means the engagement of "the complemental clutch members 50 and B9 is controlled. When they are engaged the nut rotates at a slightly faster speed than the screw, and the screw is so threaded (left-handed as shown) that aslight advance of the boring bar and projection V of the tool towards the work follows. Inlorder that the tool may be withdrawn rapid- 1y upon completion ofa cut, I provide means whereby the nut may be held immovable with respect to the boring bar; conveniently this may take the form -of 'a'fixed clutch means 25, fixed to the casing 29 and surrounding the, screw, and

upon the upper end of the clutch sleeve 6 I pro-j vide clutchteeth '62 ,whichare engageable with the teeth-25.".Thus, as may be seen in Figure 4,

upon raising the yoke 1, these teeth are engaged,

and now thenut lllkis held fixed with relation If the nut H) were free to rotate with and at idler gear.

to the boring bar 2, and as the screw continues a to rotate, the boring bar is'rapidy raised.

It will be remembered that the cutting tool 3i must be retracted when the boring bar is being raised or retracted, and that raising the rod 33 accomplishes or permits retraction of the tool.

' Now, since raising of the boring bar is brought about as a result of raising the sleeve 6, it is convenient to insure raising of the rod 33 and the ensuing retractionof the'tool at the same time and by the same means. The rod 33 is provided with a flange 36, beneath which are engageable of the rod 33.

V-Operation of the clutch sleeve 6 under control of the yoke fl is controlled by an arm 15projecting from the yoke through a suitable slot in the cas ng .25., To insure that the clutch members 25 and 62=do not remain in engagement after the boringbar'has been fully retracted, and thereby damage the machine, I provideautomatic throw-- out means which, in the form shown, consists of. a lever'l'il pivoted at H upon the top of the casing 2B,one.arm of this lever engaging a pin l2 projecting upwardly from the control arm 15, so thatthe latter may be depressedupon downward movement of the arm ML-and the other arm '53 is disposed beneath a head- !5 secured upon the upper end of the screw- I. As the boring bar and the casing ZB move upwardly under the influence ofthe temporarily fixednut ii], the head l5 contacts the "arm '13 and depresses it, and in doing so depresses the pin 12 and the arm 15, thus moving downward the sleeve 6, and disengaging the clutch teeth 52 from the fixed teeth 25.

In ca'se it is desired to arrange 'thetool so as to permit moving the boringfbar downward rapidly the arrangement .of Figures 7 and 8 maybe em- ,ployed. In:..this form; gear teeth 65 are. formed upon the sleeve'e, by. means of which the nut It. may be directlyrotated whenneither of the clutch elements are inengagement, that is to say, when the clutch sleeve 8 is in neutral-positien; In mesh with the gear 6 is one portion 5"! of a two-part The other part 553 is i mesh at all times with one of the other gears, for instance, the driven ge r35, so that it rotates continuously, and in order to prevent rotation'of. the nut ex cept as this may be desired to advance the tool and boring bar rapidly, the two partsoi the idler gear, 6? and 58 respectively, are connected by a tapered friction clutch, illustrated at 69?. The two parts may be engaged by suitable means, as for instance by a screw 65 threaded in the casing 2%. When the'twc parts of the clutch 69 are pressed tegether the upper portion 51 is driven from the lower portion 58, and when the pressure is relieved the natural friction of the parts disconnects the clutch at 59', and prevents drive of the nut gear 56. Rotation of the sleeve 6 through this idler gear 6?, 52, effects rapid rotation of the nut relative to the screw,'in-;a direction to cause advance or projection of the boring bar.

What I claim as my invention is:

,1. A cylinder-'reboring machine comprising a supporting frame, a boring bar vertically disposed andvertically movable therein, a rotary tool supported at the lower end of said bar, a casing supported upon the upper end of the bering bar and,

to engagethe first clutch means to effect slow rotation of the screw relative-to the nut in a. direction to advance the tool, or alternatively to engage the fixed clutch means to effect rapid rotation of the screw relative to the now fixed nut in the opposite direction, to retract the tool.

8. A cylinder reboring machine comprising a boring bar vertically disposed" and 'vertically movable, a rotary tool supported at the lower end of said bar, a screw disposed parallel to said boring bar, means to rotate the screw, a driven gear journaled upon the upper end-of the boring bar and operatively connected to rotate said tool, a drive gear iournaled about the screw and slidingly keyed thereto, adifferential gear journaled coaxially with the drive gear, both the differential gear and the drive gear meshing with the driven gear, whereby the toolis rotated, and the differential gear being of substantially the same diameter and having slightly fewer teeth than the drive gear, whereby the differential gear is driven at a peripheral speed slightly faster than that of the drive gear, a nut threaded on the screw,

clutch means associated with the differential gear, other clutch means fixed relative to the boring bar and coaxial with but spaced from the first clutch means, and complemental clutch means non-rotatively engaged with the nut, means to shift said complemental clutch means to engage the first clutch means to effect slow boring bar vertically disposed and vertically movable, a rotary tool supported at the lower end of said bar, a screw disposed parallel to said boring bar, means to rotate the screw, a driven gear journaled upon the upper end of the boring bar and operatively connected to rotate said tool, a drive gear journaled about the screw and slidingly keyed thereto, a differential gear journaled coaxially with the drive gear, both the differential gear and the drive gear meshing with the driven gear, whereby the tool is rotated, and the differential gear being of substantially the same diameter and having slightly fewer teeth than the drive gear, whereby the differential gear is driven at a peripheral speed slightly faster than that of the drive gear, a nut threaded on the screw, clutch means associatedwith thedifferential gear, other clutch means fixed relative to the boring bar and coaxial with but spaced from the first clutch means, and complemental clutch means non-rotatively engaged with the nutymeans to shift said complemental clutch means to engage the first clutch means to effect slowirotation of the screw relative to the nut in a,

direction to advance the tool, or alternatively to engage the fixed clutch means to effect rapid ment by said head as the nut approaches the 7 upper end of thescrew to disengage the complemental clutch means from the fixed clutch means.

a cylinder reboring machine, in combination, a base to rest upon the top of a cylinder block, an upright screw rotatably mounted in said base and held thereby against longitudinal move- 'ment, mean s carried by the base for rotating said coupleand uncouple said'nut with and'from said I rotary member.

11. In a cylinder reboring machine, in combination, a base to rest upon the top of a cylinder block, an upright screw rotatably mounted in said base and .held' thereby against longitudinal movement, means carried by the base for rotating said screw, a bar parallel to said screw and mounted in the base for longitudinal movement relative thereto, a shaft carried by said bar, a cutting tool carried by the lower end of said shaft, means for the transmission of rotary movement of said screw to said shaft, a rotary member driven by said screw at a speed different from the speed of rotation of said screw, a nut threaded on said screw and held against longitudinal movement relative to said bar, and clutch means operable to selectively couple said nut with and from said rotary member and with and from the bar;

12. The combination as set forth in claim 11 in which the-clutch means hasan intermediate position permitting free rotation of the nut with the'screw.

13. In a cylinder reboring machine, in combination, a base to rest upon the top of a cylinder block, an upright screw rotatably mounted in said base and held thereby against longitudinal movement, means carried by the base for rotating said screw, a barparallel to said screw and mounted in the base for longitudinal movement relative thereto, a shaftcarried by said bar, a cutting tool carried by the lower end of said shaft, 2, gear on said shaft, a driving connection between said screw and said gear forthe transmission of rotary motion of the screw to the shaft, a second gear in mesh with said first mentioned gear and driven thereby'at a'speed different from the speed of rotation of the screw, a nut threaded on the screw and held against longitudinal movement relative to the bar, and clutch means operable to selectively couple and uncouple said nut with and from said second mentioned gear, to hold the nut against rotation relative to the bar, and to permit free rotation-of the nut'with the screw.

14..In a cylinder reboring'machine, in combination, a base to rest upon the top of a cylinder block, an upright screw rotatably mounted in said base and held thereby against longitudinal movement, means carried by the base for rotating said screw, an upright bar parallel to said screw mounted in the base for longitudinal movement relative thereto, a housing carriedby the upper end of said bar; a. shaft extending through said bar, a cutting tool carried by the lower end of said shaft, a gear on said shaft within said housing,

Z a driving gearsplined tosaid screw and in mesh with said first mentioned gear whereby the shaft is rotatably driven by the screw, a gear coaxial with the screw and in mesh with the first mentioned gear. and driven by said first mentioned andthe shaft and the tool, and clutch means oper gear at a speeddifierent from the speed of rotaable to selectively couple and uncouple said nut 'tion of the screw, a nut threaded on the screw with and. from said last mentioned gear, to hold within the housing and held against longitudinal the nut against rotation relative to the housing movement relative to the housing whereby moveand bar, and to permit free rotationof the nut 5 ment of the nut along the screw efiects correwith the screw. c

sponding movement of the housing and. the bar I CLARENCE T. ROT' ILER. 

